Teat
Part of speech: noun
Definition: The projection of a mammary gland from which, on female mammals, milk is secreted. An artificial nipple used for bottle-feeding infants.
Tit
Part of speech: noun
Definition: A mammary gland, teat.A woman's breast.An idiot; a fool.A light blow or hit (now usually in phrase tit for tat).A small passerine bird of the genus Parus or the family Paridae, common in the northern hemisphere.A small horse; a nag.A young girl, later especially a minx, hussy.